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DESCRIPTION
Demonstration circuit DC1505A features the LTC
overvoltage protection controller that safeguards 2.5V to
5.5V systems from input supply overvoltage. The LTC4360
is designed for portable devices with multiple power sup-
ply options including wall adapters, car battery adapters
and USB ports.
The LTC4360 controls an external N-channel MOSFET in
series with the input power supply. During overvoltage
transients, the LTC4360 turns off the MOSFET within 1µs,
isolating downstream components from the input supply.
Inductive cable transients are absorbed by the MOSFET
and load capacitance. In most applications, the LTC4360
provides protection from transients up to 80V without
requiring transient voltage suppressors or other external
components.
The LTC4360 has a delayed start-up and adjustable
dV/dt ramp-up for inrush current limiting. A PWRGD pin
DEMO MANUAL DC1505A
4360 an
provides power good monitoring for V
®
features a soft shutdown controlled by the ON pin. The
LTC4360-2 has a GATEP pin that drives an optional ex-
ternal P-channel MOSFET for negative voltage protection.
Following an overvoltage condition, the LTC4360 automati-
cally restarts with a start-up delay.
DC1505A demonstrates three protection schemes selected
with a jumper: (A) overvoltage protection, (B) overvoltage
and negative voltage protection, and (C) overvoltage, nega-
tive voltage, and reverse current protection. Each option
has an output LED and can be applied to a USB protected
output. Protection (A) features the LTC4360-1 with ON
control. Protection (B) and (C) feature the LTC4360-2 and
a P-channel MOSFET driven by GATEP .
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Figure 1. Demonstration Circuit 1505A
LTC4360 Overvoltage
Protection Controller
1505a FO1
. The LTC4360-1
IN
dc1505af
1
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Related Manuals for Linear Technology DC1505A
Summary of Contents for Linear Technology DC1505A
- Page 1 The LTC4360 has a delayed start-up and adjustable http://www.linear.com/demo dV/dt ramp-up for inrush current limiting. A PWRGD pin L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 1505a FO1 Figure 1.
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Page 2: Performance Summary
DEMO MANUAL DC1505A PERFORMANCE SUMMARY Table 1. Typical DC1505A Performance Summary (T = 25°C) PARAMETER CONDITION VALUE Input Voltage Protection (A) OV 0V to 30V Protection (B) OV/NV –30V to 30V Protection (C) OV/NV/RC –30V to 30V Output Voltage Input Range for Gate Turn-On 2.1V to 5.8V... - Page 3 DEMO MANUAL DC1505A QUICK START PROCEDURE SELECT PROTECTION OVERVOLTAGE PROTECTED PWRGD – SELECT ENABLE 1505a FO2a Figure 2a. DC1505A Protection (A) Setup for Overvoltage dc1505af...
- Page 4 1505a FO2b Figure 2b. DC1505A Protection (B) Setup for Overvoltage, and Negative Voltage SELECT PROTECTION – OVERVOLTAGE, NEGATIVE VOLTAGE, REVERSE CURRENT PROTECTED OUT PWRGD 1505a FO2c Figure 2c. DC1505A Protection (C) Setup for Overvoltage, Negative Voltage, and Reverse Current dc1505af...
- Page 5 DEMO MANUAL DC1505A QUICK START PROCEDURE PLUG USB CABLE USB CABLE USB DEVICE SELECT SELECT USB PROTECTION PROTECTION (JP3 MUST MATCH JP1) PROTECTION (A) SELECT ENABLE 1505a FO3 Figure 3. DC1505A USB Protection Setup dc1505af...
- Page 6 The amber V LED indicates if the The DC1505A is used to evaluate the LTC4360 in three input supply is on while a green OUT(B) LED indicates the protection configurations selected at JP1. The device in gate is on and the input is passed over to the output.
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Page 7: Schematic Diagram
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. - Page 8 Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods.
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